Alarm



FIG. 1 is a front elevation view of an alarm;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines depict unclaimed environmental subject matter. 

What is claimed is the ornamental design for an alarm, as shown and described. 